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Long-term Debt (Details) (USD $)
 9 Months Ended 0 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 09, 2011
May 31, 2009
Mar. 31, 2009
Aug. 31, 2008
Sep. 30, 2012
Amended and Restated Loan and Security Agreement [Member]
Sep. 09, 2011
Term Loan [Member]
Sep. 09, 2011
Term Loan [Member]
Initial Payments [Member]
Sep. 09, 2011
Term Loan [Member]
Interim Payments [Member]
Sep. 09, 2011
Term Loan [Member]
Final Payment [Member]
Sep. 30, 2012
Term Loan [Member]
Final Payment [Member]
Debt Instrument [Line Items]                        
Debt Instrument, Face Amount               $ 25,000,000        
Interest Rate (in hundredths)               9.87%        
Number of payments                 12 29 1  
Payment amount                 20,833 825,000 825,000  
Maturity Date               Mar. 01, 2015        
Debt Instrument, Fee description               At maturity of the Term Loan, the Company will make a final payment fee equal to 5% ($1,250,000)        
Debt Instrument, Fee Amount               300,000       1,250,000
Warrants issued to lenders (in shares)               132,891        
Date from which Warrants are exercisable               Sep. 09, 2011        
Warrant exercise price (in dollars per share)       $ 2.62 $ 2.59 $ 8.50   $ 3.01        
Warrant expiration date               Sep. 09, 2018        
Term Loan remaining balance at date of Amendment             15,600,000          
Prorated Fee amount             419,000          
Net proceeds from issuance of Term Loan 0 9,444,000           8,600,000        
Debt Instrument, Modification               We accounted for this amendment as debt modification since the terms of the amended Term Loan and the Original Term Loan were not substantially different and as present value of cash flows of the modified instrument (using a net method of comparing the present value of cash flows related to the lowest common principal balance between the old and the new loans) was within 10% of the original debt instrument. Accordingly, the fees associated with the amended Term Loan of $300,000, final payment fee of $1,250,000, and the existing unamortized debt discount from the Original Term Loan of $332,000 will be amortized as an adjustment of interest expense over the term of the Amended Term Loan using the effective interest method.        
Debt Instrument, Unamortized Discount             332,000          
Fair value of warrants issued in connection with loan     $ 267,000                  
Effective interest rate (in hundredths)     13.63%